I'd like to add custom check for winperf counters, in particular DNS counters

Troubleshooting
2

Answering my own question. I used the winperf_ts_sessions to get the actual check started… though for my check I’ll be checking an ever growing counter and graphing requests/sec. But answering the question, here is the check_mk.user.yml lines of interest:

winperf:
    enabled: yes
    counters:
        - DNS: cjc_dns